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TS 23.380 (CT4) ★
IMS Restoration Procedures

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for a better overview, the Table of Contents (ToC) is reproduced

V16.1.0 (Wzip) 2019/09 55 p.

V15.2.0 (PDF) 2019/09 56 p.

V14.1.0 2016/12 46 p.

V13.5.0 2016/12 46 p.

V12.4.0 2016/09 33 p.

V11.4.0 2016/09 20 p.

V10.3.0 2014/03 18 p.

V9.6.0 2014/03 18 p.

V8.5.0 2012/09 13 p.

Rapporteur: Ms. Bartolome, Maria-Cruz

Although network nodes in the IMS Core Network should have a very high availability, some maintenance downtime and occasional failures are unavoidable. Communication links although designed with robust protocols between the network elements are also subject to failures. This document specifies a set of standardized procedures for automatic restoration after loss or corruption of data reducing the impact of these problems in order to improve service to the users. The scenarios covered here for the IMS Domain are similar to those covered in TS 23.007 for the CS and PS Domains.

This TS specifies the procedures required in 3GPP IMS to handle a S-CSCF service interruption scenario with minimum impact to the service to the end user.

full Table of Contents for TS 23.380 Word version: 16.1.0

1 Scope Word-p. 7

3 Definitions, symbols and abbreviations Word-p. 8

3.1 Definitions

3.2 Abbreviations

4 Restoration of Data in the S-CSCF Word-p. 9

4.2 Registration Procedure

4.2.1 Introduction

4.2.2 S-CSCF Restoration after Failure

4.2.3 S-CSCF Restoration during Registration Process

4.3 UE Terminating Procedure Word-p. 10

4.3.1 Introduction

4.3.2 S-CSCF Restoration after Restart

4.3.3 S-CSCF Restoration after Failure Word-p. 11

4.4 UE Originating Procedure

4.4.1 Introduction

4.4.2 S-CSCF Restoration after Restart

4.4.3 S-CSCF Restoration after Failure Word-p. 12

4.5 SIP-AS Originating Procedure

4.5.1 Introduction

4.5.2 S-CSCF Restoration after Restart

4.5.3 S-CSCF Restoration after Failure

4.6 S-CSCF Data Restoration Information Backup and Update Procedures Word-p. 13

4.6.1 Introduction

4.6.2 Backup and Update of S-CSCF Restoration Information during Registration Process

4.6.3 Backup and Update of S-CSCF Restoration Information after UE's Subscription

4.6.4 Backup and Update of S-CSCF Restoration Information after P-CSCF's Subscription [R16] Word-p. 14

5 Recovery after P-CSCF failure [R9]

5.1 Update PDP context/Bearer at P-CSCF failure

5.1.1 General requirements

5.1.2 Network recovery information flow - Update PDP context / Bearer Word-p. 15

5.1.3 Network recovery information flow with S5 PMIP [R11] Word-p. 16

5.2 Inform UE about P-CSCF failure Word-p. 17

5.2.1 General requirements

5.2.2 Network recovery information flow - Inform UE at P-CSCF failure

5.2.3 Network recovery information flow - Inform UE at P-CSCF failure with S5 PMIP [R11] Word-p. 19

5.3 Network recovery information flow - UE uses keep alive mechanism Word-p. 20

5.4 HSS-based P-CSCF restoration for 3GPP access [R12] Word-p. 21

5.4.1 Introduction

5.4.2 Description

5.4.2.1 General

5.4.2.2 P-CSCF restart/failure detection by S-CSCF Word-p. 23

5.4.2.2.1 General

5.4.2.2.2 Direct connection from S-CSCF to P-CSCF

5.4.2.2.3 S-CSCF connection to P-CSCF via IBCF/ATCF

5.4.2.3 MME/SGSN mechanism support Word-p. 24

5.4.3 PCO-based optional extension

5.4.3.1 Introduction

5.4.3.2 Description

5.4.4 UE indication of support for "Update PDP context/bearer at P-CSCF failure" Restoration [R16] Word-p. 27

5.4.5 Coexistence with "Update PDP context/bearer at P-CSCF failure" mechanism

5.4.6 HSS based P-CSCF restoration in roaming scenarios

5.5 PCRF-based P-CSCF restoration [R12] Word-p. 28

5.5.1 Introduction

5.5.2 PCRF-based P-CSCF restoration information flow - deactivate PDN connection/PDP context

5.5.3 PCO-based optional extension Word-p. 31

5.5.3.1 Introduction

5.5.3.2 Description

5.5.3.3 UE indication of support for "Update PDP context/bearer at P-CSCF failure" Restoration

5.5.4 Coexistence with "Update PDP context/bearer at P-CSCF failure" mechanism

5.5.5 P-CSCF restoration in roaming scenarios for PCRF based solution

5.6 P-CSCF restoration for WLAN [R13] Word-p. 32

5.6.1 Introduction

5.6.2 Basic mechanism for the HSS-based solution

5.6.2.1 Overview and principles

5.6.2.2 Description

5.6.3 Basic mechanism for the PCRF-based solution Word-p. 34

5.6.4 Optional extension for the HSS and PCRF-based solutions for the TWAN access

5.6.4.1 Overview and principles

5.6.4.2 Description Word-p. 35

5.6.4.3 Indication of UE support of the P-CSCF restoration extension for the TWAN access Word-p. 36

5.6.5 Optional extension for the HSS and PCRF-based solutions for the untrusted WLAN access

5.6.5.1 Overview and principles

5.6.5.2 Description

5.6.5.3 Indication of UE support of the P-CSCF restoration extension for the untrusted WLAN access Word-p. 38

5.6.6 Supported features and capabilities

5.6.6.1 Introduction

5.6.6.2 Feature support in the HSS and S-CSCF

5.6.6.3 Feature support in the 3GPP AAA Server

5.6.6.4 Feature support in the PGW Word-p. 39

5.6.6.5 Feature support in the TWAN

5.6.6.6 Feature support in the ePDG

5.6.6.7 Capability support in the UE

5.7 Interaction between P-CSCF restoration and NBIFOM [R13] Word-p. 40

5.7.1 Introduction

5.7.2 HSS-based solution

5.7.3 PCRF-based solution Word-p. 41

5.8 P-CSCF Restoration for 5GC [R15]

5.8.1 Introduction

5.8.2 Common Procedures for P-CSCF Restoration in 5GC

5.8.2.1 General

5.8.2.2 P-CSCF Address List Update Procedure Word-p. 42

5.8.2.3 DHCP based P-CSCF Selection Triggering Procedure

5.8.2.4 PDU Session Release with Reactivation Procedure Word-p. 43

5.8.3 P-CSCF Failure Detection at SMF/UPF Word-p. 44

5.8.3.1 Overview and Principles

5.8.3.2 P-CSCF Monitoring and Failure Detection Procedure

5.8.4 UDM/HSS Based P-CSCF Restoration Word-p. 46

5.8.4.1 Overview and principles

5.8.4.2 Trigger P-CSCF Restoration Procedure via SMF

5.8.4.3 Trigger P-CSCF Restoration Procedure via AMF Word-p. 48

5.8.5 PCF Based P-CSCF Restoration Word-p. 49

5.8.5.1 Introduction

5.8.5.2 Trigger P-CSCF Restoration Procedure via PCF

5.9 P-CSCF Restoration in EPC with 5GC interworking [R15] Word-p. 50

5.10 P-CSCF Restoration in EPC for untrusted WLAN when N10 is used instead of S6b [R16]

6 Recovery after SCC AS failure [R13]

6.2 General Procedure Word-p. 51

6.2.1 Enhanced Third Party Registration Procedure

6.2.1.1 Introduction

6.2.1.2 Description

6.2.2 Enhanced Service Request Procedure Word-p. 52

6.2.2.1 Introduction

6.2.2.2 Description

A Change history Word-p. 53